2 PCI Express GPU ?s

Discussion in 'Mac Pro' started by schulmaster, Nov 3, 2010.

  1. schulmaster macrumors member

    Aug 7, 2010
    1. If I plan to solely run Windows, will a PC(not MAC official) GPU boot properly into Windows in a 2010 Mac Pro?

    2. If my current GPU uses two 6pin aux power connectors, and my new one would use 1 six and 1 eight, can I safely use a 6 to 8 pin adapter on one cable for the new GPU?

    Thanks, s
  2. jav6454 macrumors P6


    Nov 14, 2007
    1 Geostationary Tower Plaza
    1. Theoretically yes, practically, yes.

    2. Yes, but heed caution. 6-pins can only sustain 75W draw, a 8-pin sustains 150W draw... you are going to draw 150W from a 75W line... things might get toasty if you abuse.
  3. neckarb macrumors regular

    Jun 29, 2007
    1. Yes, I'm using a 5970 and 5870 trifire In windows, works just fine.
    2. Yep
  4. schulmaster thread starter macrumors member

    Aug 7, 2010
    I've read in a couple of places that the extra two pins function as grounds? Im not planning to OC at all, and want to insure that there is no risk to my tracers under load in this config.
  5. macz1 macrumors 6502


    Oct 28, 2007
    If you want to be on the safe side, you can route one of the power connectors of the optical drives to your graphics card. If you have already two drives installed, you can use a power splitter.
    I also don't like the idea to overstress the current lines on the mainboard...

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